He might be involved is some, but it's not just him.
Here's what Copilot says...
who is paying for all the lawsuits against the trump administration
The funding for lawsuits against the Trump administration comes from various sources, including state governments, cities, nonprofit organizations, and private entities. For example, Denver has joined lawsuits challenging federal funding cuts, and multiple states have sued over budget freezes2. Additionally, universities like Harvard have filed lawsuits over revoked federal funding.
Many of these legal challenges are backed by advocacy groups and legal organizations that raise funds through donations and grants. Some lawsuits are also supported by congressional appropriations meant to reimburse cities for costs incurred due to federal policies
Here are a couple articles on the subject...
As the incoming team develops executive orders and initiatives, critics are hiring staff and reviewing lessons of the first term.
www.marketplace.org
California, New York and Illinois are among states readying to sue the Trump administration over divisive social issues.
www.legaldive.com
As I said, this was planned.